//更新变体数量 可以通过变体公式计算 另外是否可通过编译出的文件计算？
public void UpdateVariantCount()
{
totalVariantCount = 0;
actualBuildVariantCount = 0;
//遍历pass
for (int i = 0; i < passes.Count; i++)
{
StripShaderPass pass = passes[i];
int matCount = materials.Count;
int pasStripCount = 1;
int passBuildCount = 1;
//遍历编译指令行
for (int l = 0; l < pass.keywordLines.Count; l++)
{
StripKeywordLine line = pass.keywordLines[l];
//kLineEnabledCount 所有enable的keyword 有没有 _
int kLineEnabledCount = line.hasUnderStriporeVariant ? 1 : 0;
//line.keywords 里不包含 __ 有_ 关键字+1
int kLineCount = kLineEnabledCount;
//如果是 缩写的关键字
if (ShaderHelper.IsBuiltinShortcut(line.shaderLineType))
{
StripKeyword[] stripKeyword = null;
if (pass.hasSkipKeyword)
{
stripKeyword = pass.skipKeywords.ToArray();
}
kLineCount += ShaderHelper.GetShortcutVariantCount(line.shaderLineType, stripKeyword);
}
//multi_compile shader_fearure 要除去skip
else if (ShaderHelper.IsInputShortcut(line.shaderLineType) && line.shaderLineType != ShaderLineType.SKIP_VARIANTS)
{
if (ShaderHelper.IsSahderFeature(line.shaderLineType) && line.keywords.Count == 1)
{
kLineCount += 2;
}
else
{
kLineCount += line.keywords.Count;
}
}
for (int k = 0; k < line.keywords.Count; k++)
{
StripKeyword keyword = line.keywords[k];
if (keyword.enabled)
{
//如果是 shader feature检查是否有材质使用
if (ShaderHelper.IsBuiltinShortcut(line.shaderLineType) || ShaderHelper.IsSahderFeature(line.shaderLineType))
{
for (int m = 0; m < matCount; m++)
{
//遍历关联的材质
if (materials[m].ContainsKeyword(keyword.name))
{
kLineEnabledCount++;
break;
}
}
}
else
{
kLineEnabledCount++;
}
}
}
//实际使用的关键字
if (kLineEnabledCount > 0)
{
//实际使用的参与编译的 指令行的指令乘积
passBuildCount *= kLineEnabledCount;
}
//全部编译指令行的指令乘积 包括没有使用的fearure
pasStripCount *= kLineCount;
}
totalVariantCount += pasStripCount;
actualBuildVariantCount += passBuildCount;
}
//计算enabed关键字数量
keywordEnabledCount = 0;
int keywordCount = keywords.Count;
for (int k = 0; k < keywordCount; k++)
{
if (keywords[k].enabled)
{
keywordEnabledCount++;
}
}
}